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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3a5900877341d322d2775a95c1c964780464300bcecbe51c3a73a608fad2e0' 
  AND token = '8nD+eadS7wMOZ0qIp4l+MpIU9JMxpd0Dg0aqlYLOCLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}